HOMO and LUMO energies of EtBr before and after adsorption.

		E HOMO	E LUMO	E HOMO–ELUMO
EtBr	α	−3.25 eV	−0.30 eV	−2.95 eV
	β	−4.62 eV	−1.43 eV	−3.19 eV
ZnO–EtBr	α	−3.64 eV	−1.56 eV	−2.08 eV
	β	−4.42 eV	−2.09 eV	−2.33 eV